3D

https://en.wikipedia.org/wiki/3D

Systems
http://www.3dsystems.com/

Hubs
https://www.3dhubs.com/

Print
http://3dprinting.com/
https://3dprintingindustry.com

Forest
http://www.3dforest.eu/

Metric
https://3dmetricuniverse.wordpress.com

Tube
https://www.youtube.com/results?search_query=3d

Slides
http://www.slideshare.net/search/slideshow?searchfrom=header&q=3d